Ìgbà Dẹfoníà: Ìyàtọ̀ láàrin àwọn àtúnyẹ̀wò
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(Kò ní yàtọ̀)
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Àtúnyẹ̀wò ní 13:33, 18 Oṣù Kẹfà 2011
| Ìgbà Dẹfoníà 416–359.2 ẹgbẹgbẹ̀rún ọdun sẹ́yìn | |
| Fáìlì:LateDevonianGlobal.jpg | |
| Mean atmospheric O2 content over period duration | ca. 15 Vol %[1] (75 % of modern level) |
| Mean atmospheric CO2 content over period duration | ca. 2200 ppm[2] (8 times pre-industrial level) |
| Mean surface temperature over period duration | ca. 20 °C[3] (6 °C above modern level) |
| Sea level (above present day) | Relatively steady around 180m, gradually falling to 120m through period[4] |
The Devonian is a geologic period and system of the Paleozoic Era spanning from 416 to 359.2 ẹgbẹgbẹ̀rún ọdún sẹ́yìn (ICS, 2004,[5] chart). It is named after Devon, England, where rocks from this period were first studied.
During the Devonian Period the pectoral and pelvic fins of lobe-finned fish evolved into legs[6] as they started to walk on land as tetrapods around 397 Ma.[7] Various terrestrial arthropods also became well-established.
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Itokasi
- ↑ Image:Sauerstoffgehalt-1000mj.svg
- ↑ Image:Phanerozoic Carbon Dioxide.png
- ↑ Image:All palaeotemps.png
- ↑ Haq, B. U.; Schutter, SR (2008). "A Chronology of Paleozoic Sea-Level Changes". Science 322 (5898): 64–68. doi:10.1126/science.1161648. PMID 18832639.
- ↑ Gradstein, Felix M.; Ogg, J. G.; Smith, A. G. (2004). A Geologic Time Scale 2004. Cambridge: Cambridge University Press. ISBN 0521786738.
- ↑ See Tiktaalik.
- ↑ [1] Fossil tracks record 'oldest land-walkers' - BBC News
